/Engine/Source/Runtime/Engine/Public/AI/NavigationSystemHelpers.h
void ExportChaosHeightFieldSlice ( const [FNavHeightfieldSamples](API\Runtime\Engine\AI\Navigation\FNavHeightfieldSamples) & PrefetchedHeightfieldSamples, const int32 NumRows, const int32 NumCols, const FTransform & LocalToWorld, const FBox & SliceBox )